When securing a second trailer, which of the following actions is NOT needed?

When securing a second trailer, the action of securing the tractor to the first trailer is not needed at that specific step of the process. The focus at this stage is primarily on correctly positioning and securing the dolly to the second trailer, which involves adjusting the brakes, wheeling the dolly into position, and releasing the dolly brake. These actions ensure that the dolly can effectively connect to the second trailer for safe transport. Securing the tractor to the first trailer is something that would have already been done prior to this step, making it unnecessary at the moment of securing the second trailer.